Button-hole attachment



(ModeL) 2 Sheets-Sheet 1.

' J. M. ,GRIEST;

v BUTTON HOLE ATTACHMENT. No. 362,442. Patented May 3', 1887.

gay i 2% N PETERS, Pnuwfim m hur. Wnshinglon. lz'cv (Mode'L) 2Sheets-Sheet '2.

J, M. GRIE-ST. BUTTON HOLE ATTACHMENT.

No. 362,442. Patented May 3, 1887.

braced by my Patents Nos. 332, 251 and 335,126,

or lever operated by the needle-bar of the ma- JOHN M. GRIEST, OF

BUTTON-HOLE PATE T Orrin.

CHICAGO, ILLINOIS.

ATTAC H M ENT.

SPECIFICATION forming part of Letters Patent No. 362,442, dated May 3,1887.

Application filed August 21, 1886. Serial No. 211,486. (ModeL) To allwhom it may concern:

Be it known that I, J oHN-M. GRIEsT, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements'in Button-Hole Attachmentsfor Sewing-Machines, of which the following is aspecification, referencebeing had therein tothe accompanying drawings.

My invention relates to that class of buttonhole attachments for sewingmachines em in which the longitudinal or feeding movements of theworkclamp are effected by a double screw intermittingly rotated from anarm chine, and in which the vibrating or lateral movements of the saidclamp are produced by a threepointed cam rotating coineidently with thesaid feeding-screw, the object of the present invention being tosimplify the construction and to render more certain and positive theoperation of certain features of the device to which my patentsaforesaid relate.

In the drawings, Figure 1 is a plan view of my improved attachment. Fig.2is a similar View with some of the parts removed. Fig. 3 is a side viewof my device. Figs. land 5 are sectional end views thereof. Fig. 6 is acrosssection on line 6 6, Fig. 1. Fig. 7 is a detail perspective view ofthe sliding bar and its arm and yoke. Fig. 8 is an enlarged sectionaldetail of the sliding bar and its adjustable arm. Fig. 9 is a detailperspectiveview of the sliding plate, and Fig. 10 a similar view of theretaining-spring for the yoke surrounding the double screw.

A denotes the base-plate of the attachment, said plate having twoupwardly-turned or vertical portions, a and a, forming standards tosupport the operating mechanism for the feedplate B, the forward end,I), of which forms the lower jaw of the work-clamp, the upper jaw, b, ofthe said clamp being carried by a spring-lifted lever, b pivoted to theplate A and forced against the work in clamping by a cam-lever, b Thefulcrum-pin c, on which the feed-plate B swings laterally to produce thenecessary side movements for effecting the over-edge stitching of thebutton-holes, is carried by a plate, O, adjustably secured to the plateA, said pin projecting through a central slot in the plate B and into aslot in the plate A, in which latter slot the said pin is ad ustable,for the purpose of varying the lateral movements of the cloth-clamp tochange the bight of the button-hole stitches.

D is a double screw journaled in arms or projections a of the standarda. To the rear end of the said screw is attached the threepointed cam E,working'in a laterally-sliding yoke, e, having steadying lugs or proections 6 extending through the standards a and a and connected with thefeed-plate B, as will be hereinafter described, so as to impart lateralmovements thereto from the cam E. To the forward end of the screw D isattached the ratchet-wheel F,- having six teeth, said wheel beingoperated .by the spring-presscd pawl g, pivoted to the yoke G, turningloosely on the shaft of the screw D, and having teeth g meshing withsimilar teeth, h, on the operating-1e ver H, pivoted at its rear end tothe standard a, and adapted at its forward end for engagement with ascrew or other projection on the needle-bar of the machine.

The parts of my device thus far described are or may be essentially thesame as in the attachments described in my patents hereinbefore referredto, and I will now describe the parts to which the present improvementsrelate. 7

To the feed-plate B is attached a small plate or arm, b*, having anupwardly-projecting portion provided with a slot, b, into which enters adownwardly-extending lug or tail, z, of a yoke, I, surrounding thedouble screw B and rigidly attached by its shank i to a sliding bar orshaft, J, supported by the arms a of the standard a. The bar or shaft J15 provided with two curved arms, K and K, the

.latter of which is adj ustably secured to said shaft by a set-screw, k.'Ihebar or shaft J is preferably provided with a series of holes orrecesses, j, the distances between the centers of which are the same asthe distances between the centers of the threads on the double screw D,and thescrew k is preferably pointed, as shown in Fig. 8, so that itwill readily center itself to any one of the said recesses to which itmay be adjusted. The cam E is provided with a pin or project-ion, e",and the ICO ratchet-wheel F also has a similar pin or projection, f. Thecentral opening in the yoke I is somewhat larger than the diameter ofthe double screw D, so that only one side of said yoke need be inengagement with said screw, and the sliding bar or shaft J, to which thesaid yoke is attached, is rocked slightly at intervals to bring one sideor the other of said yoke into engagement with either the upper or lowerside of said screw, for the purpose of reversing the movement of thefeed-plate and the work-clamp carried thereby by means of the engagementof one or the other of the arms K and K with the pins or projections fand 0 as will be hereinafter more fully explained.

The yoke I is provided with a lug or project-ion, i which is engaged bya spring, L, attached to the standard a by the pivot screw a for theoperating-lever H, said spring having a forked right-angular portion, L,at its forward end to embrace the shaft of the double screw D, and thusprevent the spring from moving vertically when the lug '11 is beingmoved from one side to the other of the ledge L", pressing against saidlug. The office of the spring L, operating in connection with the lug iis to hold the yoke I in either of the positions into which it may beforced by the action of the pins f and c on the arms K and K of thesliding bar or shaft J.

The lateral movements of the sliding yoke c are communicated to thefeed-plate B (to vibrate the latter in the formation of the overedgestitches) through the shipper-lever M and screw-pin m, which latterengages the said plate by the slot 71 therein, the said lever be ingnormally held rigid with the said yoke, so that the lateralreciprocating movements thereof are imparted to the said plate tovibrate the same on its fulcrum-pin 0 through the said screw-pin m.

The lever M is provided with a slot, m, to admit of the variation of theposition of the said screw-pin to increase or diminish the distancebetween the said pin and the fulcrumpin m by which the said lever ispivotally attached to the sliding yoke e, and by virtue of thisconstruction the ship-over movements of the work-clamp may be varied tochange the distance between the rows of stitches on opposite sides ofthe button-holes. The ship per-lever M is provided with a lug, in,engaging an arm, n, on a sliding plate, N, having arms a ,embrael ng thesliding bar J, which supports the said plate, the latter being providedwith a spring or spring arm, a", the free end of which is adapted toengage notches a in the top of the standard a. The plate N is alsoprovided with an arm, M, in the vertical inner portion of which ispivoted a switch, 0, engaging a short section, (I, of the double screwD, which latter is mutilated by the omission of one or more threads forthe purpose of separating the said short section (I from the mainportion of the screw by which the yoke I is operated. Sufficient spaceis left on both sides of the short screw-section d, so that when theswitch 0 is on either side thereof it will be out of engagement with thethreads of the said section until the sliding plate N is moved slightlyin one direction or the other by the engagement of one of the arms K orK of the bar J with one of the arms a of the plate N to bring theswitehinto engagement with one side or the other of the screwscction d,and the latter will then slowly shift the plate N the distancedetermined by the length of the said scrcwsection. This movement of theplate N causes the shipper-lever M to turn on its fulcrum-pin m and byits pin on shift the feed-plate to bring the second side of thebutton-hole beneath the needle after the first side of the hole has beencompleted. As the shipover movement consumes the time required to formseveral stitches, the buttonhole will be properly barred at both endsand the barring stitches will he so spread out and disposed as to make aneat finish. During the ship-over movement the lever M (although turningslowly on its fulcrum'pin m") is still practically rigid with the yoke0, so that the vibratory movements of the feed-plate B (due to thelateral reciprocations of the said yoke and lever) still continue,although the position of the said feed-plate is gradually changed toshift the work and thus cause the bar to be formed while the unworkedside of the but ton-hole is being brought over beneath the needle.

Vhen the device is set in operation with the work in the cloth-clamp andthe operating-lever in engagement with the needle-bar of the machine,the vibrating movements of said lever will impart an intermittent rotarymove ment to the double screw 1) through the pawland-ratchet mechanismabove described, and the three-pointed cam E, rotating with saidscrew,will reciprocate the sliding yoke c, and, through the shipperleverM, cause the feedplate and the cloth-clamp carried thereby to bevibrated to give the proper movements to the work necessary for theformation of the over-edge or button-hole stitches. The rotation of thescrew D causes the yoke I, engaged therewith, to move lengthwise of saidscrew, and the said yoke being connected with the fced-plale, as abovedescribed, the latter is caused to travel lengthwise until one or theother of the arms K K, secured to the bar or shaft .l', which travelswith the yoke I, comes into position to be engaged by one of the pins orprojections f or c", when the said bar or shaft is rocked slightly, andthe yoke I is caused to engage the side of said double screw opposite tothat which was previously in engagement, so that the movement of theyoke and of the feed-plate operated thereby is re versed. Just prior tothis reversal of the feed ing movement one of the arms a of the slidingplate N will be engaged by one of the arms K or K of the bar J, and theship-over movement of the eloth-clamp is effected in the manner abovedescribed. The plate N is reiIO IIS

taiued in either of its stationary positions by the engagement of theend of the spring a in the notches a" of the standard a.

To rock the shaft J, as above described, the arms K and K are movedbythe pins f and c from the position indicated by full lines to thepositions shown by dotted lines in Figs. 4 and 5. i

I claim 1. In a button-hole attachment, the combination, with alaterally-vibrating feed-plate and the work-clamp carried thereby, of anintermittingly-rotating double screw, a sliding bar or shaft havingarms, a yoke connected with said bar or shaft and feed-plate andembracing said screw, and devices, as pins f 2 e operatively connectedwith said screw and adapted to engage said arms to change the positionof said yoke, substantially as set forth.

2. The combination, with the laterally vibrating feed-plate and itswork-clamp, of an intermittingly-rotating double screw, a yoke connectedwith said feed-plate and loosely embracing said screw, and a sliding baror shaft by which the said yoke is carried and which is adapted to berocked slightly to bring the said yoke int-o engagement with theopposite sides of said screw to move the said feed-plate in oppositedirections, substantially as set forth.

3. The combination, with the feed-plate and workclainp, of a sliding baror shaft having two arms, one of which is adjustable, a double screw, ayoke connected with said bar or shaft and feed-p1ate, and pins orprojections turning with the said screw and adapted to engage said armsto rock the said sliding bar or shaft slightly and thusv change theposition. of said yoke to reverse the movement of the said feedplate,substantially as set forth.

4. The combination, with the feed-plate and work-clamp, of theintermittingly rotating double screw, the sliding bar or shaft having aseries of holes or notches, the distances between the centers of whichare equal to the dis tance between the centers of the threads of saidscrew, a yoke carried by said bar or shaft, fixed and adjustable armsattached to the latter, and'a screw for securing said adjustable arminany desired position, substantially as Set forth.

5. The combination, with the feedplate, work-clamp,and the sliding baror shaft and its arms, of the yoke connected with said bar or shaft andfeed-plate, the intermittingly-rotating double screw, the cam E,provided with the pin or projection e", and the ratchet-wheel F, havingthe pin or projection f substantially as set forth.

- 6. The combination, with the feed-plate, work-clamp, and double screw,of the sliding bar or shaft and its arms, the yoke connected with saidbar or shaft and feed-plate, the shipper-lever, and a sliding plate, N,connected with said shipper-lever and adapted to be engaged by the armsof the said sliding bar or shaft to change its positions, substantiallyas set forth.

7. The combination, with the feed-plate, work-clamp, and the doublescrew mutilated to form a short section, d, of the shipper-lever M andthe sliding plate N, connected with the shipper-lever, and the switch 0,carried by the said sliding plate, substantially as set forth.

8. The combination, with the feed-plate,

work-clamp, and the double screw D, muti-- lated to form the shortsection d, of the ship per-lever-M, the sliding plate N, connected withthe said shipper-lever and provided with the retainingspring orspring-arm ad, the notched standard a, .with which the said spring-armengages, and the switch 0, carried by the said sliding plate,substantially as set forth.

9. The combination, with the feedplate, work-clamp, and the double screwprovided with the cam E, of the sliding yoke e, operated by said cam,the shipper-lever M, pivoted to said yoke and connected with saidfeedplate, the sliding bar N, having an arm, a, eugaging the saidshipper-lever, and devices for shifting the position of the said slidingplate to operate said shipper lever and thereby effect the ship-overmovement of the feedplate and work-clamp, substantially as set forth. 1

10. The combination, with the double screw, of the yoke I, looselyembracing said screw, the sliding bar or shaft J, by which the said yokeis carried, and means by which the said shaft is rocked slightly tobring the said yoke into engagement with the opposite sides of the saidscrew, and a spring for retaining said yoke in its different positions,substantially as set forth.

1.1. The combination, with the double screw, the sliding and rocking baror shaft J, and the yoke I, carried by the latter and having the lug orprojection i of the spring L, having the ledge L substantially as setforth.

In testimony whereof I affix my signature in presence of two witnesses.Y

7 JOHN M. GRIEST.

Witnesses:

GEORGE L. Form, E. M. Snmns.

